Can I change the source sheet if I upgrade my app to PRO?
Yes.
The ability to change the source sheet has no correlation with the plan type.
You can do it anytime you want, regardless of plan.
It means i can totaaly change whole source sheet, can you tell me how to do that?
Settings → Data → Data Sources
Be careful though, if your new sheet isn’t an exact match of your old sheet in terms of sheet/column names, then you’ll almost certainly break your app.
I’d strongly advise making a duplicate of your app (and sheet), and test it with that first.
okay, thank you:)